A reverse IP domain check uses a domain name or an IP address that points to one web server to find a list of all the sites hosted on that web server.
A reverse DNS/IP lookup is made possible with the help of PTR records. The PTR records help find the domain name associated with the IP address. Hence, this approach can be used for the following:
A reverse IP/DNS lookup will query the domain name registry and registrar tables to try to resolve a domain name to the given IP address. If the result returns a domain, your IP address is connected to your domain.
Figure 1: Reverse DNS Lookup in action
Consider the figure shown above to understand a reverse DNS lookup. First, it asks the internet, "Who does this IP address belong to?". Then, the internet will perform a reverse DNS lookup query and return the domain name associated (connected) to the IP address. Essentially, it produces a human-readable string for the user.
The figure above shows a user trying to find out to whom the given IP address belongs. The DNS server performs the reverse DNS lookup, identifies that the IP address is associated with "google.com", and informs the user.
To perform a reverse DNS lookup using this tool:
(view all free tools)